NSTSE (National Science Talent Search Exam- Unified Council) Class 6: Questions 1751 - 1758 of 2029

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Question 1751

Question

MCQ▾

In how many states water exist?

Choices

Choice (4)Response

a.

Four

b.

Three

c.

Two

d.

One

Question 1752

Question

MCQ▾

Why pure water is not a conductor of electricity?

Choices

Choice (4)Response

a.

Absent of impurities

b.

Absent of Sulphur

c.

All of the above

d.

None of the above

Question 1753

Question

MCQ▾

What happens when Aluminium react with boiled water?

Choices

Choice (4)Response

a.

Forms Al2H3

b.

Liberate oxygen

c.

Liberate hydrogen

d.

All of the above

Question 1754

Question

MCQ▾

A heterogeneous mixture is

Choices

Choice (4)Response

a.

Made up of only one kind of atoms

b.

A solid – liquid mixture

c.

A gas – liquid mixture

d.

Made up of different kind of atom

Question 1755

Question

MCQ▾

We separate mixture to remove .

Choices

Choice (4)Response

a.

Useful Substance

b.

Harmful Substance

c.

Undesirable substance

d.

Both b. and c. are correct

Question 1756

Question

MCQ▾

Complete the following reaction

3Fe + 4H2O ⇾ + 4H2

Choices

Choice (4)Response

a.

Fe3O4

b.

Fe2O3

c.

Fe3 (OH)2

d.

Fe3O5

Question 1757

Question

MCQ▾

In filament bulbs there՚s a gas ‘Y’ is present to increase its lifetime. So the gas is ________ gas.

Choices

Choice (4)Response

a.

Oxygen

b.

Argon

c.

Neon

d.

Carbon di-oxide

Question 1758

Question

MCQ▾

Which of the following material is opaque?

Choices

Choice (4)Response

a.

Air

b.

Wood

c.

Glass

d.

Glass lenses

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